Now the solar unit has two products to sell separately: the green tag and the power.

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"We were worried as we are always worried because it meant uncertainty, " said Martha Duggan, the vice president of regulatory and government affairs for the solar unit of Energy Conversion Devices.

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The solar mission in its first phase focused on areas already connected to the grid and had a pricing system that bundled four units of thermal electricity with one unit of solar-based power, which reduced the average per-unit cost of solar electricity.

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